Day of the Animals

Day of the Animals is a 1977 American horror film thriller directed by William Girdler and based on a story written by Edward L. Montoro. Premiering on May 13, 1977, the movie reunited stars Christopher George and Richard Jaeckel, director Girdler and producer Montoro from the previous years hit film Grizzly.

A battle for survival begins as a group of mountain hikers in Northern California encounter a chemically imbalanced forest. The recent depletion of the Earths ozone layer causes the sun to shine powerful ultraviolet light carrying some kind of solar radiation that somehow causes all animals above the altitude of 5,000 feet to run amok and kill, which is very unfortunate for a group of hikers including Christopher George, Lynda Day George, and Leslie Nielsen who get dropped off up there by helicopter just before a quarantine is announced for all the surrounding towns. This has a dramatic effect on the rest of the nation, turning common household pets and pests into vicious attackers.Over the course of the movie, multiple wild and dangerous animals stalk and attack the hikers, and eventually start picking them off. These include a mountain lion, a grizzly bear, a pack of wolves and several birds of prey hawks, falcons, eagles and owls. ........

Source: Wikipedia